Mitsubishi Electric PLH-2 User manual

Air-Conditioners
PLH-2, 2.5KKC
E
FOR INSTALLER
INSTALLATION MANUAL
For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
ON/OFF –
STAND BY
DEFROST
CENTRALLY CONTROLLED
˚C
CLOCK
ON OFF ˚C
1Hr.
NOT AVAILABLE
CHECK MODE
FILTER
CHECK
TEST RUN

2
E1. Safety Precautions
1.1. Before installation and electric work
sSince this unit contains rotating parts and parts which
could cause an electric shock,be sure to read all of the
“Safety Precautions” before operating the unit.
sThe “Safety Precautions” provide very important points
regarding safety. Make sure you follow them.
sPlease report to or take consent by the supply author-
ity before connection to the system.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger
of injury or death to the user.
Caution:
Describes precautions that should be observed to prevent damage
to the unit.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Indicates that caution should be taken with rotating parts. (This sym-
bol is displayed on the main unit label.) <Color: Yellow>
: Indicates the main switch. (This symbol is displayed on the main
unit label.) <Color: Blue>
Warning:
Carefully read the labels affixed to the main unit.
1.1. Before installation and electric work
This Installation Manual and the Operation Manual should be given to the
user of the air conditioner. The user should keep both manuals in a place
where they are accessible at any time. If the air conditioner must be moved
or repaired, these manuals should be made available to the service per-
sonnel. These manuals should be kept with the air conditioner at all times
and passed on to subsequent users.
Warning:
• The unit should not be installed by the user. Ask the dealer or an
authorized technician to install the unit. If the unit is installed im-
properly, water leakage, electric shock or fire may result.
• Use only accessories authorized by Mitsubishi Electric and ask
the dealer or an authorized technician to install them. If accesso-
ries are installed improperly, water leakage, electric shock or fire
may result.
• The Installation Manual details the suggested installation method.
Any structural alteration necessary for installation must comply
with local building code requirements.
• The user should never attempt to repair the unit or transfer it to
another site. If the unit is repaired improperly, water leakage, elec-
tric shock or fire may result. If the air conditioner must be re-
paired or moved, consult the dealer.
1. Safety Precautions ................................................................................... 2
2. Indoor unit installation location ................................................................. 7
3. Outdoor unit installation location .............................................................. 8
4. Installing the indoor unit .......................................................................... 11
5. Installing the outdoor unit ....................................................................... 15
6. Cooling pipe and drain pipe ................................................................... 16
7. Electrical work ........................................................................................ 20
8. Test run .................................................................................................. 28
9. Troubleshooting ..................................................................................... 30
10. Field electrical wiring (Power wiring specifications) ............................... 31
11. Installing the grille .................................................................................. 32
EContents

3
E
1.1. Before installation and electric work
Warning:
•The unit must be securely installed on a structure that can sus-
tain its weight. If the unit is mounted on an unstable structure, it
may fall down causing injuries.
•Use only specified cables for wiring. The connections must be
made securely without pulling on the terminals. Improper con-
nections or installation may generate heat or cause a fire.
•The unit should be installed according to the instructions in or-
der to minimize the risk of damage from earthquakes, typhoons
or strong winds. An improperly installed unit may fall down and
cause damage or injuries.
•When installing an optional air cleaner or humidifier, be sure to
use only products specified by Mitsubishi.
All accessories must be installed by an authorized technician.
The user must not try to install accessories. Improperly installed
accessories can cause water leakage, electric shock or fire.
•Do not turn on the power until installation has been completed.
Failure to do so may cause an electric shock or fire.
1. Safety Precautions
1.1. Before installation and electric work
Warning:
•All electric work must be performed by a licensed technician, ac-
cording to local regulations and the instructions given in this
manual.
The units should be powered by dedicated power lines. Power
lines with insufficient capacity or improper electrical work may
result in electric shock or fire.
•The terminal block cover of the outdoor unit must be firmly at-
tached to prevent entry of dust and moisture. Improper mounting
of the cover can cause electric shock or fire.
•Use only the specified refrigerant (R-22) to charge the refrigerant
circuit. Do not mix it with any other refrigerant and do not allow
air to remain in the circuit. Air enclosed in the circuit can cause
pressure peaks resulting in a rupture and other hazards.
•If the air conditioner is installed in a small room, measures must
be taken to prevent the refrigerant concentration in the room from
exceeding the safety limit in the event of refrigerant leakage.
Consult the dealer regarding the appropriate measures to pre-
vent the allowable concentration from being exceeded. Should
the refrigerant leak and cause the concentration limit to be ex-
ceeded, hazards due to lack of oxygen in the room could result.
•Ventilate the room if refrigerant leaks during operation.
If the refrigerant comes in contact with a flame, poisonous gases
will be released.

4
E
1.1. Before installation and electric work
Caution:
•Do not install the equipment where combustible gas may leak
and accumulate resulting in fire.
•Do not keep food, plants, caged pets, artwork or precision instru-
ments in the indoor unit’s direct airflow or too close to the unit,
as these items can be damaged by temperature changes or drip-
ping water.
•When the room humidity exceeds 80% or when the drain pipe is
clogged, water may drip from the indoor unit. Do not install the
indoor unit where such dripping could cause damage.
The outdoor unit produces condensation during the heating op-
eration. Make sure to provide drainage around the outdoor unit if
such condensation is likely to cause damage.
•This air conditioner should not be installed in areas exposed to
thick steam, volatile oil (including machine oil) or sulphuric smoke,
as this could significantly reduce its performance and damage
the internal parts.
1. Safety Precautions
1.1. Before installation and electric work
Fuse or breaker
AFuse or breaker
BMain power switch
CPower supply wiring
Disconnection must be incorporated in the fixed wiring.
Caution:
•When installing the power lines, do not apply tension to the ca-
bles, as this could loosen the connections, generate heat and
cause a fire.
•Use only a fuse of specified capacity. A fuse of larger capacity or
a steel or copper wire could cause a general unit failure or fire.
•Make sure to install an earth leakage breaker as this device helps
reduce the risk of electric shocks. Installation of an earth leakage
breaker is mandatory in some areas.
•For the power lines, use standard cables of sufficient current ca-
pacity. Otherwise, current leakage, overheating or fire may occur.
Earth connection
Caution:
Make sure to install a grounding line. Do not connect the grounding
line to gas or water pipes, lightning conductors or telephone ground-
ing lines. Improper grounding may cause an electric shock.
“WARNING-THIS APPLIANCE MUST BE EARTHED”
A
C
B

5
E
1.1. Before installation and electric work
Drain piping
Caution:
•Install drain piping according to this Installation Manual to en-
sure proper drainage. Place thermal insulation on the pipes to
prevent condensation. Improper drain piping may cause water
leakage and damage to furniture or other possessions.
•Thermal insulation of the drain pipes is necessary to prevent dew
condensation. If the drain pipes are not properly insulated, con-
densation will result and drip on the ceiling, floor or other pos-
sessions.
Miscellaneous
Caution:
Do not wash the air conditioner units. Washing them may cause an
electric shock.
1. Safety Precautions
1.1. Before installation and electric work
Caution:
•Be extremely careful when transporting the units. Two or more
persons are needed to handle the unit, as it weighs 20 kg or more.
Do not grasp the bands of the crate. Instead, insert your hands
into the cutouts in the crate. Wear protective gloves to extract the
unit from the crate and to move it, as you could injure your hands
on the fins or other parts.
•Transport the unit in its package and unpack it only on the instal-
lation site.
•The base and attachments of the outdoor unit should be periodi-
cally checked for looseness, cracks or other damage. If such de-
fects are left uncorrected, the unit may fall and cause personal
injury or property damage.
•Be sure to safely dispose of the packaging materials. Packaging
materials, such as catches and other metal or wooden parts, may
cause stabs or other injuries.

6
E1. Safety Precautions
1.2. Before starting the trial run
Caution:
•Before starting operation, check that all panels, guards and other
protective parts are correctly installed. Rotating, hot or high volt-
age parts can cause injuries.
•Do not touch the refrigerant pipes with bare hands during opera-
tion. The refrigerant pipes are sometimes hot and sometimes cold
depending on the condition of the flowing refrigerant. Your hands
may suffer burns or frostbite if you touch the pipes.
•Turn on the main power switch more than twelve hours before
starting operation. Starting operation just after turning the main
power switch on can result in severe damage to internal parts.
Keep the main power switch turned on during the operation sea-
son.
•Keep the outlets and inlets free of obstacles. Otherwise, the per-
formance may be reduced or operation may stop.
1.2. Before starting the trial run
Caution:
•Do not touch any switch with wet fingers, as this can cause an
electric shock.
•Do not operate the air conditioner without the air filter set in place.
Dust may accumulate, and cause a failure.
•After stopping operation, be sure to wait for five minutes before
turning off the main power switch. Otherwise, water leakage or
unit failure may occur.

7
E2.
Indoor unit installation location
2.1. Outline dimensions
(mm)
Models W D H
PLH-2, 2.5 760 760 307
•Mount the indoor unit on a wall strong enough to withstand the weight
of the unit.
•Select a location so that air can be blown into all corners of the room.
•Avoid locations exposed to outside air.
•Select a location free of obstructions to the airflow in and out of the
unit.
•Avoid locations exposed to steam or oil vapour.
•Avoid locations where combustible gas may leak, settle or be gener-
ated.
•Avoid installation near machines emitting high-frequency waves (high-
frequency welders, etc.)
•Avoid locations where the airflow is directed at a fire alarm sensor.
(Hot air could trigger the alarm during the heating operation.)
•Avoid places where acidic solutions are frequently handled.
•Avoid places where sulphur-based or other sprays are frequently used.
2.2. Service space
•Select ideal blowing direction according to the shape of room and in-
stalling position.
ACeiling
BCeiling panel
CObstacle
D1 m or more
E50 cm or more (Entire periphery)
FPanel
•Reserve the above mentioned space for doing the piping and wiring
work, as well as for the maintenance work which is done from the
bottom & left/right sides. Similarly, reserve as much space as possible
to facilitate work & safety at the time of suspending.
B
FCE
D
A
H30
DW

8
E2.
Indoor unit installation location
2.3. Refrigerant pipes
sCheck that the difference between the heights of the indoor and
outdoor units, the length of refrigerant pipe, and the number of
bends in the pipe are within the limits shown below.
Models (A) Pipe length (B) Height (C) Number of
(one way) difference bends (one way)
PLH-2 max. 40 m max. 40 m max. of 12
PLH-2.5 max. 50 m max. 50 m max. of 15
•Height difference limitations are binding regardless of which unit, in-
door or outdoor, is positioned higher.
ALength of refrigerant pipe
BHeight difference
CNumber of bends
DIndoor unit
EOutdoor unit
DA
B
C
E
3.1. Outline dimensions
(mm)
Models W D H A B C
PUH-2 870 295 650 500 185 330
PUH-2.5 870 295 850 500 185 330
•Avoid locations where combustible gas may leak, settle or be gener-
ated.
•Avoid locations exposed to direct sunlight or other sources of heat.
•If direct sunlight cannot be avoided, always install a sunshade to pro-
tect the outdoor unit from the sun.
•Select a location from which noise emitted by the unit will not incon-
venience neighbours.
•Bear in mind that during operation, drain water may flow from the unit.
•Avoid locations where the unit could be covered by snow.
In areas where heavy snow fall is anticipated, special precautions must
be taken to prevent the snow from blocking the air outlet or blowing
directly against it, as this would reduce the airflow and cause a mal-
function.
•Select a location permitting easy wiring and piping access to the power
source and indoor unit.
WD
H
A
B
C
E3.
Outdoor unit installation location

9
E3.
Outdoor unit installation location
3.2. Ventilation and service space
When installing a single outdoor unit
1Service space
Maintain an easily accessible service space in front of the unit as shown
in the diagram.
A10 mm or more
B500 mm or more
C500 mm or more
DService space
2Top obstacles
If there are no obstacles in front or at the left or right of the unit, obstacles
above the unit are permitted as shown in the diagram.
E100 mm or more
F500 mm or more
•The front, right and left sides must be free of obstacles.
3Unobstructed front (blowing side)
If the size of the space reserved for the unit is as shown in the diagram,
the unit can be installed so that obstacles are at the right, left and rear.
G10 mm or more
H200 mm or more
•The front and top must be unobstructed.
•The height of obstacles on either side must be the same or lower than
that of the outdoor unit.
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C
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G
G
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3.2. Ventilation and service space
4Obstacles in the front (blowing side) only
If there are obstacles in front of the unit, keep the back, left/right, & top
unobstructed.
IMin. 500 mm
5Obstacles at the front & rear only
The outdoor unit cannot be used except if the following conditions are
met:
An optional outdoor air outlet guide (left/right & top unobstructed) must be
fitted.
Moreover, if there is no natural wind flowing between the obstacles, keep
the height or width of the obstacles within the following range to prevent
the risk of short cycling. (If either the front or rear satisfies the require-
ments, there is no special restriction on the remaining side).
JObstruction width: 1.5 times the width of outdoor unit or smaller
KObstruction height: Unit height or lower
LAir outlet guide
MMin. 500 mm
NMin. 100 mm
6Obstacles on 4 surrounding sides
The unit cannot be used if there are obstacles on all 4 surrounding sides,
even if there is more than the prescribed amount of space around the
outdoor unit and if the top is unobstructed.
7Obstacles at the front & rear
This unit cannot be used if the following conditions are met:
PMax. 3000 mm
QMax. 100 mm
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10
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3.2. Ventilation and service space
When installing many outdoor units
1Side-by-side arrangement
Remove the side screw on the pipe cover.
Keep the top unobstructed.
AMin. 100 mm
BMin.10 mm
CMin. 200 mm
DUp to 10 units (When the air outlet guides (sold separately) are used, no
more than five units should be arranged side by side.)
EMin. 1000 mm
•Refrigerant piping and electric wiring cannot be attached on the right
side.
2Face-to-face arrangement (with air outlet guide)
Fit an optional outdoor air outlet guide on each unit and set them to “up-
ward blow”.
FMin. 200 mm
GMin. 500 mm
3Face-to-face arrangement (without air outlet guides)
HMin. 200 mm
IMin. 1200 mm
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A
B
C
E
D
F
G
H
I
1
2
3
3.2. Ventilation and service space
4Parallel arrangement (with air outlet guides)
Fit an optional outdoor air outlet guide on each unit.
JMin. 1000 mm
5Parallel arrangement (without air outlet guides)
KMin. 3000 mm
4
5
J
K
3. Outdoor unit installation location